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公开(公告)号：DE69903372T2
公开(公告)日：2003-07-10
申请号：DE69903372
申请日：1999-04-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FREDERICO , YI CHO ALFRED , FAIST JEROME , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: A novel superlattice quantum cascade (SLQC) laser has undoped SL active regions, with the dopant concentration in the injector region being selected, such that, under an appropriate electrical bias, the SL active region is substantially electric field free. The absence of dopant atoms in the SL active region results in reduced carrier scattering and reduced optical losses, with consequent low threshold current and/or room temperature operation. The novel laser emits in the mid-IR spectral region and can be advantageously used in measurement or monitoring systems, e.g., in pollution monitoring systems.
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公开(公告)号：DE69900427T2
公开(公告)日：2002-06-27
申请号：DE69900427
申请日：1999-05-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAILLARGEON JAMES NELSON , CAPASSO FEDERICO , CHO ALFRED YI , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: A novel quantum cascade (QC) laser comprises a multiplicity of identical repeat units, with each repeat unit comprising an active region and an injector region. The injector region comprises quantum wells and barriers, selected to facilitate, under appropriate bias, resonant carrier transport from a lower energy level of a given active region to an upper energy level of an adjacent downstream active region. Carrier transition from the energy level to a lower energy level of an active region results in emission of infrared radiation. The laser is advangeously used in, e.g., a measurement system for detection of trace compounds in air.
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公开(公告)号：CA2342080A1
公开(公告)日：2001-11-08
申请号：CA2342080
申请日：2001-03-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAILLARGEON JAMES NELSON , SIVCO DEBORAH LEE , CHO ALFRED YI , CAPASSO FEDERICO , HUTCHINSON ALBERT LEE , GMACHL CLAIRE F , PAIELLA ROBERTO
Abstract: A self mode-locking (SML) mid-infrared (5 and 8 .mu.m) quantum cascade laser is formed that comprises both a relatively thin dielectric insulating layer (i.e., less than one-half micron in thickness) overlaid with an optically highly lossy (i.e., absorbing) layer, with a relatively long (approximately 3.5 mm) optical waveguide. Evidence of mode-locking is obtained from the measured optical spectra and corresponding interferograms, as well as from the rf spectra of the photocurrent detected with a fast quantum-well infrared photodetector. A n estimate for the pulse width of approximately 3 psec is inferred from these data.
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公开(公告)号：DE69703595T2
公开(公告)日：2001-04-19
申请号：DE69703595
申请日：1997-03-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SIRTORI CARLO , SIVCO DEBORAH LEE , CAPASSO FEDERICO , FAIST JEROME , CHO ALFRED YI , HUTCHINSON ALBERT LEE
Abstract: The disclosed improved quantum cascade (QC) laser comprises features that facilitate lasing at temperatures above 260K, preferably above 300K. Among the features is a wavefunction-increasing feature that enhances the amplitude of the lasing level wavefunction (3) in the adjacent upstream barrier layer, thereby increasing carrier injection efficiency into the lasing level. Exemplarily, the wavefunction-increasing feature is an approximately disposed thin quantum well (15). Among the features typically is also a chirped superlattice in the injection/relaxation region (12) that acts as a Bragg reflector to suppress escape of carriers from the lasing level into the continuum, while facilitating carrier extraction from the ground (2) state into a miniband, with the energy width of the miniband decreasing over at least a portion of the thickness of the injection/relaxation region. An InP top cladding layer is also used to optimize heat dissipation.
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公开(公告)号：DE60114286T2
公开(公告)日：2006-07-13
申请号：DE60114286
申请日：2001-04-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAILLARGEON JAMES NELSON , CAPASSO FEDERICO , CHO ALFRED YI , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , PAIELLA ROBERT , SIVCO DEBORAH LEE
Abstract: A self-mode-locking (SML) mid-infrared (5 and 8 mu m) quantum cascade laser is formed that comprises both a relatively thin dielectric insulating layer (18) (i.e., less than one-half micron in thickness) overlaid with an optically highly lossy (i.e., absorbing) layer (20), with a relatively long (approximately 3.5 mm) optical waveguide. Evidence of mode-locking is obtained from the measured optical spectra and corresponding interferograms, as well as from the rf spectra of the photocurrent detected with a fast quantum-well infrared photodetector. An estimate for the pulse width of approximately 3 psec is inferred from these data.
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Patent Agency Ranking
公开(公告)号：DE60114286D1
公开(公告)日：2005-12-01
申请号：DE60114286
申请日：2001-04-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAILLARGEON JAMES NELSON , CAPASSO FEDERICO , CHO ALFRED YI , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , PAIELLA ROBERT , SIVCO DEBORAH LEE
Abstract: A self-mode-locking (SML) mid-infrared (5 and 8 mu m) quantum cascade laser is formed that comprises both a relatively thin dielectric insulating layer (18) (i.e., less than one-half micron in thickness) overlaid with an optically highly lossy (i.e., absorbing) layer (20), with a relatively long (approximately 3.5 mm) optical waveguide. Evidence of mode-locking is obtained from the measured optical spectra and corresponding interferograms, as well as from the rf spectra of the photocurrent detected with a fast quantum-well infrared photodetector. An estimate for the pulse width of approximately 3 psec is inferred from these data.
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公开(公告)号：CA2342080C
公开(公告)日：2005-01-04
申请号：CA2342080
申请日：2001-03-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： PAIELLA ROBERTO , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , CHO ALFRED YI , BAILLARGEON JAMES NELSON , CAPASSO FEDERICO , SIVCO DEBORAH LEE
Abstract: A self-mode-locking (SML) mid-infrared (5 and 8 .mu.m) quantum cascade laser is formed that comprises both a relatively thin dielectric insulating layer (i.e., less than one-half micron in thickness) overlaid with an optically highly lossy (i.e., absorbing) layer, with a relatively long (approximately 3.5 mm) optical waveguide. Evidence of mode-locking is obtained from the measured optical spectra and corresponding interferograms, as well as from the rf spectra of the photocurrent detected with a fast quantum-well infrared photodetector. A n estimate for the pulse width of approximately 3 psec is inferred from these data.
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公开(公告)号：DE69903200T2
公开(公告)日：2003-06-12
申请号：DE69903200
申请日：1999-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , CHO ALFRED YI , CHU SUNG-NEE GEORGE , FAIST JEROME , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE
Abstract: A quantum cascade (QC) laser has a multilayer core region comprising alternating layers of a first and a second semiconductor material, with lattice constants a1 and a2, respectively. The first material is selected such that a1 > ao, where ao is the lattice constant of the substrate (typically InP), and the second material is selected such that a 2 ao. The materials are also selected such that the conduction band discontinuity DELTA Ec between the first and second materials is greater than 520 meV in absolute value. The multilayer core comprises a multiplicity of essentially identical multilayer repeat units. The layer thicknesses and materials of the repeat units are selected to substantially provide strain compensation over a repeat unit. QC lasers according to this invention preferably comprise a distributed feedback feature, (e.g., a Bragg grating) selected to ensure single mode laser emission, and can be designed for operation at a wavelength in the first atmospheric window, typically about 3-5 mu m. Such lasers can advantageously be used for absorption spectroscopy, e.g., for emission monitoring.
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公开(公告)号：CA2349263A1
公开(公告)日：2002-01-07
申请号：CA2349263
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HUTCHINSON ALBERT LEE , HWANG HAROLD YOONSUNG , CHO ALFRED YI , BAILLARGEON JAMES NELSON , SIVCO DEBORAH LEE , GMACHL CLAIRE F , PAIELLA ROBERTO , SERGENT ARTHUR MIKE , TREDICUCCI ALESSANDRO , CAPASSO FEDERICO
Abstract: In a mesa geometry semiconductor laser, a patterned dielectric coating used to define the stripe geometry contact on the top the mesa and to provide significant waveguiding comprises a chalcogenide glass. Applications to intersubband (e.g., quantum cascade) lasers are specifically described.
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公开(公告)号：DE69703595D1
公开(公告)日：2001-01-04
申请号：DE69703595
申请日：1997-03-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SIRTORI CARLO , SIVCO DEBORAH LEE , CAPASSO FEDERICO , FAIST JEROME , CHO ALFRED YI , HUTCHINSON ALBERT LEE
Abstract: The disclosed improved quantum cascade (QC) laser comprises features that facilitate lasing at temperatures above 260K, preferably above 300K. Among the features is a wavefunction-increasing feature that enhances the amplitude of the lasing level wavefunction (3) in the adjacent upstream barrier layer, thereby increasing carrier injection efficiency into the lasing level. Exemplarily, the wavefunction-increasing feature is an approximately disposed thin quantum well (15). Among the features typically is also a chirped superlattice in the injection/relaxation region (12) that acts as a Bragg reflector to suppress escape of carriers from the lasing level into the continuum, while facilitating carrier extraction from the ground (2) state into a miniband, with the energy width of the miniband decreasing over at least a portion of the thickness of the injection/relaxation region. An InP top cladding layer is also used to optimize heat dissipation.
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